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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 07-01-2014, 09:05 AM   #1
EMANE46
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Angry help!!!!!!!! p1188 p1189

I have a 2000 323i and currently have a few codes going
p1189
p1188
p0170
p0173

I am also getting random misfires

I've done my research and have heard about vacuum leaks ect...
i have replaced the ccv, new spark plugs, new intake boots, vacuum line from the secondary air pump. I swapped my maf sensor with my brother 325xi and nothing changed. Ive heard there is a chance it could be the o2 sensors. Anybody else going through this? I am trying to avoid gong to the dealer.

I have one month left on my rejection sticker any help would be great.
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Old 07-02-2014, 03:12 AM   #2
J-king
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Did you check the disa valve?
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Old 07-02-2014, 05:41 AM   #3
EMANE46
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Yes I have j-king.... I'm replacing the o-ring today and hopefully I could get a compression test done as well.

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Old 07-02-2014, 06:53 AM   #4
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O2 sensors won't cause these problems. How many miles on the car? Have the fuel pump and filter ever been changed? Perform a fuel pressure test on the fuel rail.


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Old 07-02-2014, 07:09 AM   #5
EMANE46
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Just over 150k I don't think they have I'll have to check it out thanks markusmarkus

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Old 07-02-2014, 07:57 PM   #6
EMANE46
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Alright so I did a quick test today and change my coils from cylinders to cylinder 3&6 were misfiring I swap them around and noticed that each individual cylinder started to misfire as I put that specific coil into it. I also checked the coils for battery voltage and they all came up to spec so I'm pretty sure its the ignition coil boots. Going to bav auto in Portsmouth tomorrow to get a new set not bad a set of 6 $40.

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Old 07-12-2014, 10:00 AM   #7
hollis323
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Wow - perfect info! I'm working on resolving the exact same codes on my new (to me) 2000 323i Touring - new DISA, new intake boots, couple repaired vacuum leaks, so far. Runs like a top with the MAF unplugged (but I'm trying to figure out the problem rather than mask it).

Today I'm going for new plugs, check the function of the SAP (suspect valve operation), swisher sweets smoke test, and if I can figure it out, check the coils like you did. Thanks for the inspiration - let me know how you come out! Thanks!
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Old 07-12-2014, 10:14 AM   #8
EMANE46
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I ended up replacing two of the coil packs and all boots the misfires went way but I still have the same fuel trim codes. I ended up using a vacuum pump for air mattress, a can of coffee, a cigar and about a foot of vacuum line and made a little smoke test machine and worked pretty good I noticed a small leak and retighten the brackets but I still have the codes. Then randomly while I was and traffic I got a code for the oxygen sensors I think I'm just going to end up going to the dealer in pay for one hour of diag.

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Old 07-12-2014, 04:43 PM   #9
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Ouch - at least it sounds like you're making progress on knocking out possible issues. Let us know what your friendly dealership has to say - good luck. Thanks!
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Old 07-18-2014, 03:52 PM   #10
EMANE46
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So I went to the stealership today and paid for one hour of diag $135 later apparently I was missing a cap that covers a non-return vacuum line behind the intake manifold they replaced that for an extra 60 bucks drove back home and the check engine light came back on they had also recommended that I replace my bank 2 oxygen sensor pre-cat which I did. So far so good waiting to see if the light comes back on.

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Old 07-20-2014, 09:44 PM   #11
hollis323
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I like your smoke plan for a smoke machine. I replaced the plugs, worked through the article on testing your SAP - found the vacuum hose had disintegrated at both the check valve and the vacuum solenoid behind/under the intake manifold. Fixed the vacuum leak. Checked fuel pressure at the fuel rail - 49 psi, but residual was way low at 15 psi within just a few minutes, and then decided to try checking the coils - bingo! Cylinder number 1 was missing - moved the coil, and the miss moved with it. So - replaced the coil. Nope. Still have codes (but at least it ran better!) :-) So - finally, I broke down and replaced the MAF.... and.... so far so good! Yay!!!!
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Old 07-20-2014, 09:45 PM   #12
hollis323
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Good luck on no more CEL's!!! :-) Thanks for sharing your trouble shooting process.
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Old 07-21-2014, 03:11 PM   #13
EMANE46
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Alright so I ended up replacing the oxygen sensor and everything was fine. Then yesterday morning on a cold start I now have p1421 and p1423 codes which indicate the secondary air system. I'm going to reexamine all my hoses and the check valve also the pump today. I swear it's like I can't win with this car.

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Old 07-26-2014, 09:59 AM   #14
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Alright so today I'm going to try using seafoam to clean out the secondary air system by putting it into the vacuum hose that goes from the secondary air pump to the valve and none of the sea foam actually made it through the valve. So at this point I'm guessing I have a bad secondary air system valve. I don't think it ever opened.

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Last edited by EMANE46; 07-26-2014 at 10:25 AM.
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Old 07-27-2014, 09:02 AM   #15
hollis323
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I'm not sure which codes those are, so hopefully this is helpful (?) - There's a really good article on how to diagnose SAP problems on the forum - http://www.bavauto.com/newsletter/20...ter.pdf#page=6 It was helpful for me to go through on checking out my SAP and valve - found I had two vacuum leaks on the hose from the solenoid valve to the check valve, it was rotted out both right by the valve and also way in the back. A $1.00 piece of vacuum line, and some quality "be one with it" time reaching behind the intake, and a $12 extendable mirror (WITH light) from SEARS, and its good to go. I guess I did buy a little hand vacuum pump to check operation of the check valve, too. But - it helped with the engine codes too.
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Old 07-27-2014, 10:09 AM   #16
EMANE46
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I've already replaced that vacuum line going to the vacuum control switch.

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Old 07-27-2014, 10:13 AM   #17
hollis323
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If you know you've got vacuum to the back side of the check valve, it should be open... and no seafoam made it through... sounds like you're on the right path
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Old 07-27-2014, 01:25 PM   #18
Blademan
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Bad link or got truncated in paste.
Quote:
Originally Posted by hollis323 View Post
...There's a really good article on how to diagnose SAP problems on the forum - http://www.bavauto.com/newsletter/20...ter.pdf#page=6 It was helpful for me to go through on checking out my SAP and valve - found I had two vacuum leaks on the hose from the solenoid valve to the check valve, it was rotted out both right by the valve and also way in the back...
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Old 07-27-2014, 07:39 PM   #19
hollis323
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Sorry - try this for the link:

https://www.bavauto.com/newsletter/2...newsletter.pdf

It's the a Bavarian Autosport newsletter, "fast times" from Summer 2008 - see page 6. It was pretty helpful for me - I'm a middle of the road, shade-tree mechanic, so the article explained it at an appropriate level for my taste. Hope this one works.

Last edited by hollis323; 07-27-2014 at 07:41 PM.
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Old 07-30-2014, 12:39 PM   #20
EMANE46
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Just a quick update for you guys. My vacuum leak was coming from underneath the intake manifold right next to the vacuum control switch.I went to the dealer and apparently I was missing a cap that covers this non return line. This was causing my fuel trim codes (p1188 p1189) plus a bad o2... still battling the p1421 p1423 codes...

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